Hey guys,
not trying to rain on the fun- but as a DJ and licensed electrician I can see many things wrong with the pictures above. First, the receptacles are not "isolated" in the sense of an isolated ground receptacle- but maybe you meant isolated as they are on seperate circuit breakers.
I also see some 10 gauge wire between the CB box and the outlet boxes- hopefully it is just for extra heavy-dutiness and not on a 30 amp breaker.
I have rack case in which I have mounted 2 of the Furman power distro units
http://www.furmansound.com/pro/power_dstrbtn/powerdist1.htm This is a simple, UL listed unit having (5) 20 amp magnetic breakers (as opposed to inverse time breakers commonly used) each with a spec-grade 20 amp duplex receptacle on the rear. There is a green "on" light next to each breaker for easy at-a-glance checking of on/off. The ACD-100 can be fitted directly with a cord (6 guage min) and mounted in a rack with 2-spaces available. Great deal in an amp-rack so you can plug the amps right in with no ext. cords.
The furman unit is about $450- built to last and rack mountable.
I have a rack-enclosure above the 2 Furmans from where they are fed power. The enclosure contains a volt meter and an amp meter per phase. This way I can see how much power I am using and the voltage always available. I have a 15ft tail of Type W cord to tie to a nearby disconnect.
If no disconnect is readily available, I extend on to the cord with a 100 ft of cord. I have a box with compression lugs inside for splicing the cords.
Cost to make- about $2000.
As a note- whether legal in your area or not, and whether you carry insurance for your services or not- ALWAYS hire an electrician to connect your box. It will cost less if you call ahead and have it planned. It could save you some serious lawsuits and your own equipment if you are not totally comfortable with electrical panels and wiring.
I'm not comin' down on everyone, but as a DJ and electrician, I see a lot of "creative" wiring that, while functional, isn't safe.
Peace All
Dan
Stage 1 Sound DJ
Minnesota